Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 | // SPDX-License-Identifier: GPL-2.0 #include <linux/export.h> #include <linux/errno.h> #include <linux/gpio/consumer.h> #include <linux/spi/spi.h> #include "fbtft.h" /***************************************************************************** * * void (*write_reg)(struct fbtft_par *par, int len, ...); * *****************************************************************************/ #define define_fbtft_write_reg(func, buffer_type, data_type, modifier) \ void func(struct fbtft_par *par, int len, ...) \ { \ va_list args; \ int i, ret; \ int offset = 0; \ buffer_type *buf = (buffer_type *)par->buf; \ \ if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { \ va_start(args, len); \ for (i = 0; i < len; i++) { \ buf[i] = modifier((data_type)va_arg(args, \ unsigned int)); \ } \ va_end(args); \ fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, \ par->info->device, buffer_type, buf, len, \ "%s: ", __func__); \ } \ \ va_start(args, len); \ \ if (par->startbyte) { \ *(u8 *)par->buf = par->startbyte; \ buf = (buffer_type *)(par->buf + 1); \ offset = 1; \ } \ \ *buf = modifier((data_type)va_arg(args, unsigned int)); \ ret = fbtft_write_buf_dc(par, par->buf, sizeof(data_type) + offset, \ 0); \ if (ret < 0) \ goto out; \ len--; \ \ if (par->startbyte) \ *(u8 *)par->buf = par->startbyte | 0x2; \ \ if (len) { \ i = len; \ while (i--) \ *buf++ = modifier((data_type)va_arg(args, \ unsigned int)); \ fbtft_write_buf_dc(par, par->buf, \ len * (sizeof(data_type) + offset), 1); \ } \ out: \ va_end(args); \ } \ EXPORT_SYMBOL(func); define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, ) define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16) define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, ) void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...) { va_list args; int i, ret; int pad = 0; u16 *buf = (u16 *)par->buf; if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { va_start(args, len); for (i = 0; i < len; i++) *(((u8 *)buf) + i) = (u8)va_arg(args, unsigned int); va_end(args); fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__); } if (len <= 0) return; if (par->spi && (par->spi->bits_per_word == 8)) { /* we're emulating 9-bit, pad start of buffer with no-ops * (assuming here that zero is a no-op) */ pad = (len % 4) ? 4 - (len % 4) : 0; for (i = 0; i < pad; i++) *buf++ = 0x000; } va_start(args, len); *buf++ = (u8)va_arg(args, unsigned int); i = len - 1; while (i--) { *buf = (u8)va_arg(args, unsigned int); *buf++ |= 0x100; /* dc=1 */ } va_end(args); ret = par->fbtftops.write(par, par->buf, (len + pad) * sizeof(u16)); if (ret < 0) { dev_err(par->info->device, "write() failed and returned %d\n", ret); return; } } EXPORT_SYMBOL(fbtft_write_reg8_bus9); /***************************************************************************** * * int (*write_vmem)(struct fbtft_par *par); * *****************************************************************************/ /* 16 bit pixel over 8-bit databus */ int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) { u16 *vmem16; __be16 *txbuf16 = par->txbuf.buf; size_t remain; size_t to_copy; size_t tx_array_size; int i; int ret = 0; size_t startbyte_size = 0; fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", __func__, offset, len); remain = len / 2; vmem16 = (u16 *)(par->info->screen_buffer + offset); gpiod_set_value(par->gpio.dc, 1); /* non buffered write */ if (!par->txbuf.buf) return par->fbtftops.write(par, vmem16, len); /* buffered write */ tx_array_size = par->txbuf.len / 2; if (par->startbyte) { txbuf16 = par->txbuf.buf + 1; tx_array_size -= 2; *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2; startbyte_size = 1; } while (remain) { to_copy = min(tx_array_size, remain); dev_dbg(par->info->device, "to_copy=%zu, remain=%zu\n", to_copy, remain - to_copy); for (i = 0; i < to_copy; i++) txbuf16[i] = cpu_to_be16(vmem16[i]); vmem16 = vmem16 + to_copy; ret = par->fbtftops.write(par, par->txbuf.buf, startbyte_size + to_copy * 2); if (ret < 0) return ret; remain -= to_copy; } return ret; } EXPORT_SYMBOL(fbtft_write_vmem16_bus8); /* 16 bit pixel over 9-bit SPI bus: dc + high byte, dc + low byte */ int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len) { u8 *vmem8; u16 *txbuf16 = par->txbuf.buf; size_t remain; size_t to_copy; size_t tx_array_size; int i; int ret = 0; fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", __func__, offset, len); if (!par->txbuf.buf) { dev_err(par->info->device, "%s: txbuf.buf is NULL\n", __func__); return -1; } remain = len; vmem8 = par->info->screen_buffer + offset; tx_array_size = par->txbuf.len / 2; while (remain) { to_copy = min(tx_array_size, remain); dev_dbg(par->info->device, "to_copy=%zu, remain=%zu\n", to_copy, remain - to_copy); #ifdef __LITTLE_ENDIAN for (i = 0; i < to_copy; i += 2) { txbuf16[i] = 0x0100 | vmem8[i + 1]; txbuf16[i + 1] = 0x0100 | vmem8[i]; } #else for (i = 0; i < to_copy; i++) txbuf16[i] = 0x0100 | vmem8[i]; #endif vmem8 = vmem8 + to_copy; ret = par->fbtftops.write(par, par->txbuf.buf, to_copy * 2); if (ret < 0) return ret; remain -= to_copy; } return ret; } EXPORT_SYMBOL(fbtft_write_vmem16_bus9); int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len) { dev_err(par->info->device, "%s: function not implemented\n", __func__); return -1; } EXPORT_SYMBOL(fbtft_write_vmem8_bus8); /* 16 bit pixel over 16-bit databus */ int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len) { u16 *vmem16; fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n", __func__, offset, len); vmem16 = (u16 *)(par->info->screen_buffer + offset); /* no need for buffered write with 16-bit bus */ return fbtft_write_buf_dc(par, vmem16, len, 1); } EXPORT_SYMBOL(fbtft_write_vmem16_bus16); |